If heritage doesn't trace ultimately to God, if bloodline doesn't spring essentially from God the Father, then one has no true father.  He only has the beast, Satan, as progenitor.

This Jesus would not tolerate.  Our Lord never spoke more harshly than when someone usurped the Father, refused to believe the Father's Word or trust the Father's will. 

To those who claimed innocence as Abraham's children without the faith of Abraham, Jesus said, "You are of your father the devil, and your will is to do your father's desires." (8:44)  He is the "father of lies."

What has Satan produced?  What has he "fathered"?  Not sons, not gentlemen, not real men.  Satan spawns liars; he instigates deceit; he confines people to guile and bolts men to falsehoods more restrictive than iron prison bars.

Jesus spoke of this in John, chapter 8.

The Jews had boasted, "Abraham is our father" (8:39) and went so far as to claim, "We have one Father-even God." (8:41)  But Jesus proved how fraudulent and contaminated their argument was.  "If God were your Father," he said, "you would love me, for I came from God."  In other words, a child of God is brother to Christ, of the same blood, of the same stock, and of the same Father and Father's love.    

According to the fallen nature, that can never be said of me, the Jews, or of anyone.  Our birthright was squandered by a reckless, disobedient ancestor named Adam of whom I, like you, am the spitting image. 

The only thing I inherited from my fathers was original sin.  No other bequest or patrimony is cure for that.  No article of a will, no the content of a safety-deposit box, no lands or properties of generations, no priceless heirloom or noble name restore what was lost in the loss of our Heavenly Father. 

We need a blood transfusion from the One who would be our Brother.  We need to be grafted to a new family tree, the genealogy of the cross.  We need God the Father to render us a legacy which cannot be earned and to which no earthly entitlement compares.  We don't need good genes or hereditary titles. We need the One who came from God, who lived and died for every generation of mankind, who identified himself with our soiled descent and gave us His noble Name.  We need and have indeed been given Jesus Christ, the Son of man and the Son of God.

By faith we receive him, not as someone who can just break us out of prison, but who substituted Himself for us in the prison house of lies and death.  He took as His own our sin, verdict, and incarceration.  We receive him, not as a step-brother or cousin once-removed, but as our very life.   

Jesus is not our next of kin.  He has made us blood of His blood and flesh of His flesh.  Don't you remember what Jesus told Mary Magdalene first thing on Easter?  He said, "Go to my brothers and say to them, 'I am ascending to my Father and your Father, to my God and your God.'" 

God has placed us directly into Jesus' genealogy, made us heirs of God and co-heirs with Christ (Romans 8:17).  He calls us brothers.

Through Jesus Christ, God is our Father.  Through rebirth, not of the flesh but of the Spirit, we are joined to Christ by Holy Baptism, released from guilt and captivity and given into the fatherly care of God who delivers us the entire wealth of the Kingdom of God, His proper Name, and his love.

"But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God." (John 1:12-13)